Abstract
A wet absorption of sulfur dioxide in a batch-type reactor was carried out, using three calcium compounds, namely, CaCO 3, CaO, and Ca(OH) 2 as absorbents. Based on Fourier Transform Infrared, X-ray diffraction, and scanning electron microscopy analyses, the different absorbents resulted in the different reaction pathways and mechanisms of crystal formation at the early reaction stage. In particular, the CaSO 3 · 1 2 H 2O produced from CaO and Ca(OH) 2 showed spherical aggregates consisting of small subparticles, rather than plate or needle-like crystals, of CaSO 4 · 2H 2O from CaCO 3. This might be due to the different solubility of the absorbents in water.
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